body {
    width: 100%;
    height: 100%;
}

.app{
    width: 52px;
    height: 57px;
    position: fixed;
    right: 0;
    bottom: 0;
}

.icon_menu {
    width: 57px;
    height: 57px;
    position: absolute;
    bottom: 2px;
    right: 2px;
    z-index: 10;
    cursor: pointer;

    span {
        display: none;
    }
}

.btn {
    width: 52px;
    height: 57px;
    background: url(../image/bg1.png) no-repeat -78px -6px;
    z-index: 1;
    position: absolute;
    bottom: 0;
    right: 0;
    margin: 0 5px 2px 0;
    cursor: pointer;
    -webkit-transition: bottom .2s, right .2s;
    -moz-transition: bottom .2s, right .2s;
    -o-transition: bottom .2s, right .2s;
    -ms-transition: bottom .2s, right .2s;
    transition: bottom .2s, right .2s;

    span {
        display: block;
        width: 22px;
        height: 24px;
        font-size: 0;
        position: absolute;
        top: 50%;
        left: 50%;
        margin-top: -12px;
        margin-left: -11px;
        overflow: hidden;
        background: url(../image/bg1.png) no-repeat;
    }
}

.btn1 {
    span {
        background-position: -176px -20px;
    }

    &.open {
        bottom: 175px;
        right: 0;
    }
}

.btn2 {
    span {
        background-position: -198px -18px;
    }

    &.open {
        bottom: 150px;
        right: 62px;
    }
}

.btn3 {
    span {
        background-position: -221px -18px;
    }

    &.open {
        bottom: 105px;
        right: 112px;
    }
}

.btn4 {
    span {
        background-position: -243px -19px;
    }

    &.open {
        bottom: 40px;
        right: 140px;
    }
}

.btn5 {
    span {
        background-position: -267px -20px;
    }
}

.btn1.close,
.btn2.close,
.btn3.close,
.btn4.close {
    bottom: 0;
    right: 0;
}